Mohammad Ahmadian was appointed as the acting deputy of the country's Atomic Energy Organization (AEOI), PressTV reported citing the Fars news agency.
Ahmadian is a university professor who has previously served as Iran's deputy energy minister and head of Iran's Nuclear Power Plants Production and Development Company - the Iranian contractor for the Busheher Atomic Power Plant Construction agreement, PressTV said.
Ahmadian's appointment followed a presidential decree appointing the AEOI's head, Ali Akbar Salehi, to the post of acting foreign minister.
Salehi will temporarily replace Manouchehr Mottaki, who served as Iran's foreign minister since 2005, while keeping his position as the AEOI chief.
In a separate statement issued by Iranian President Mahmoud Ahmadinejad, the president also expressed his gratitude to Mottaki for his service in his cabinet, according to PressTV.